Fountain pen



FIG. 1 is a side perspective view of a fountain pen showing my new design;

FIG. 2 is a front elevational view;

FIG. 3 is a right side elevational view, the left side being a mirror image thereof;

FIG. 4 is a rear elevational view;

FIG. 5 is a top plan view;

FIG. 6 is a bottom plan view;

FIG. 7 is a front perspective view with the top removed; and

FIG. 8 is a rear perspective view of the fountain pen with a front perspective view of the top, which is placed on the end remote from the writing point. 

The ornamental design for a fountain pen, as shown and described. 